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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-440
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Jun 2018

Research article | 04 Jun 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Ground-based MAX-DOAS observations of tropospheric formaldehyde and comparisons with CAMS model at a rural site near Beijing

Xin Tian1,2, Pinhua Xie1,2,4, Jin Xu2, Yang Wang3, Ang Li2, Fengcheng Wu2, Zhaokun Hu2, Cheng Liu2,4,5,6, and Qiong Zhang2 Xin Tian et al.
  • 1School of Environmental Science and Optoeclectronic Technology, University of Science and Technology of China, Hefei, 230026, China
  • 2Key laboratory of Environmental Optical and Technology, Anhui Institute of optics and Fine Mechanies, Chinese Academy of Science, Hefei, 230031, China
  • 3Max Planck Institute for Chemistry, Mainz, 55128, Germany
  • 4CAS Center for Excellence in Urban Atm ospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 5School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 6Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, 230026, China

Abstract. Formaldehyde (HCHO), a key aerosol precursor, plays a significant role in atmospheric photo-oxidation pathways. In this study, HCHO column densities were measured using Multi-axis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument at the University of Chinese Academy of Science (UCAS) in Huairou District, Beijing, which is about 50km away from the city center, during the period of October 1, 2014 to December 31, 2014, in which the Asia-Pacific Economic Cooperation (APEC) summit was organized on 3 to 12 November. Peak values of HCHO vertical column densities (VCDs) around noon and a good correlation coefficient of 0.87 between HCHO and O3 indicate that the secondary sources of HCHO through photochemical reactions of volatile organic compounds (VOCs) dominate HCHO values in the area around UCAS. Dependences of HCHO VCDs on wind fields and backward trajectories were identified and indicated that the HCHO values in the area around UCAS were considerably affected by the transports of pollutants (VOCs) from polluted area in the south. The effects of control measures on HCHO VCDs during the APEC period were evaluated. During the period of APEC conference, the averaged HCHO is 37.95% and 30.75% lower than that during the pre-APEC and post-APEC period, respectively. The phenomenon could be attributed to both effects of prevailing northwest wind fields during the APEC and strict control measures. We also compared the MAX-DOAS results with the Copernicus Atmosphere Monitoring Service (CAMS) model. The CAMS model and MAX-DOAS results are generally consistent with a good correlation coefficient of ~0.83. The peak values are well consistently captured by both data sets, but the low values are systematically underestimated by the CAMS model. The finding indicates the CAMS model can well simulate the effects of transports and the secondary sources of HCHO, but underestimate the local primary sources.

Xin Tian et al.
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We used the MAX-DOAS installed in UCAS of Beijing to evaluate the effects on HCHO. The daily variation, transport, source, and the effect of APEC emission control measures of HCHO were analyzed. Dependences of HCHO VCDs on wind fields indicated that the HCHO values were affected by the transports of pollutants from the south. The results of comparing the MAX-DOAS with the CAMS model indicate the CAMS model can well simulate the effects of transports and the secondary sources of HCHO.
We used the MAX-DOAS installed in UCAS of Beijing to evaluate the effects on HCHO. The daily...
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